When Peter Wintermute Jr was born on 20 August 1806, in Deckertown, Wantage Township, Sussex, New Jersey, United States, his father, Peter Wintermute, was 32 and his mother, Sarah Deborah Kizer, was 32. He married Emeline Lain in 1840. They were the parents of at least 2 sons and 3 daughters. He lived in Van Etten, Van Etten, Chemung, New York, United States in 1860 and New York, United States in 1870. He died on 4 May 1876, in Horseheads, Horseheads, Chemung, New York, United States, at the age of 69, and was buried in Horseheads, Horseheads, Chemung, New York, United States.
Americanized form of German Wintermut(h), a variant of Wendemuth, a nickname for an inconstant or fickle person, from Middle High German wenden ‘to turn’ + muot ‘mind’, ‘sense’, later ‘courage’.